147 years old now in 2020 - what year born?


Today, 23 October 2020 if a person is 147 years old now, what year was he born? See below:


If 147 years old, year of birth is:
1872 or 1873*
*It depends on whether he was born before or after 1 January 1873.


If now 147 years and his year of birth 1872 if he was born after 23 October 1872 until 31 december 1872 inclusively, and his year of birth is 1873 if he was born from 1 January 1873 to 23 October 1873.


Other examples:

If now 4 years, year of birth 2015 or 2016
If now 18 years, year of birth 2001 or 2002
If now 23 years, year of birth 1996 or 1997
If now 67 years, year of birth 1952 or 1953

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